Build a test function for each “*.tex” source found in a given directory path.
The path should be absolute, or relative to the root latexml-oxide checkout.
Load the embedded LaTeXML schema and return its compiled-model
serialisation in the .model plain-text format. Used by
tools/compileschema.sh stage 2 (and the --dump-model flag on
the latexml_oxide binary) to regenerate LaTeXML.model from the
same source the runtime sees.
Load the embedded LaTeXML schema (compile-time) into the runtime
MODEL. Single home for the load_model!("LaTeXML") macro
expansion — the macro generates a fresh _ModelLoader::build_model
at each call site (~600 KiB of .text per copy), so funnelling
all callers through this one function lets LTO keep exactly one
instance in the final binary. Mirrors Perl
LaTeXML::Common::Model::compileSchema (Model.pm L121-136).